The action of the scalene muscles raises the first and second ribs, and the manubrium, in deep inspiration. Avatar icon Avatar icon Sign In. Already a Subscriber? Required Required. Forgot Password? Enter an Access Code. Sign in via: Open Athens Shibboleth. Become a subscriber to watch this video. If you have received this message in error for example, you have purchased a new subscription or activated a trial , please log out and log back in to start a new session and receive access.
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Yes No. Tell us who you are. May we contact you about your feedback? The intercostal muscles are a group of 22 pairs of tiny muscles found between the ribs. These muscles play a vital role in the movement of the chest during breathing. They also help to solidify the thoracic region and protect the lungs. The 22 pairs of intercostal muscles are broken down into two groups: 11 pairs of internal intercostals and 11 pairs of external intercostals.
The external intercostal muscles are the more superficial of the two groups. Their origins are along the inferior borders of the first 11 ribs and their insertions are along the superior borders of the rib below. The fibers of the external intercostals run obliquely inferior and anterior to the origin. Contraction of the external intercostal muscles elevates the ribs and spreads them apart. The internal intercostal muscles are the deeper set of intercostal muscles.
Their origins form along the superior border of the second through twelfth ribs and their insertions form along the inferior borders of the rib above. The fibers of the internal intercostals run obliquely superior and posterior at a right angle to those of the external intercostals.
Contraction of the internal intercostal muscles depresses the ribs and pulls them closer together.
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